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(Teacher shows the following on the screen.) 1.When was electricity discovered? 2.How was it used in the following two hundred years? 3.In the early 19th century,people had no idea what the inside of the earth might look like.Can you explain what we know about it today? T:Work in groups of four to discuss the questions.Choose one of you to act as the leader of your group.Record the results of your discussion.A few minutes later,I’ll ask your leader to report your result.Are you clear about that? Ss:Yes. T:OK.You can begin. (During the discussion,teacher goes among the students and joins them in the discussion.) T:(A few minutes later)Are you ready? Ss:Yes. T:OK.Let’s look at the first question.Who’d like to answer it? S4:Electricity was discovered in 1600 by Gilbert. T:Very good!The second question,who can try? S5:After electricity was discovered,people began to use it to serve people in many fields.Take industry for example,people use it to control machines and produce a great number of products,such as cars,planes,weapons,etc. S6:Electricity is also used in agriculture.With electricity people can control the temperature and humidity to make vegetables grow better. S7:In our daily life,electricity is very useful.For example,watching TV needs electricity, playing computers needs electricity,heaters need electricity,and even our watches need electricity. So,without electricity,our life would be a mess. T:What you said is quite right.Indeed,electricity is very important to us.It is used widely in every field.The last question.Who can explain it? S8:The earth on which we live is a big ball of very hot rock,which consists of three parts:the earth’s crust,the earth’s mantle and the earth’s core.The temperature inside is very high.It’s hot inside but cold outside.It has a shell just like an egg.There are some cracks in the shell of the earth in some places.Hot water shoots into the air through those cracks and steam comes up from pools of hot water. T:Well done!You do well in geography,indeed. CStep Ⅲ Reading T:Yesterday,we talked about a famous writer,who is known for science fiction.Who is he? Ss:Jules Verne. T:Good.Do you remember the books written by him and talked about by us in the last period? Ss:Yes.(Students say out the titles of the books together.) T:Very good.Open your books and turn to Page 12.Let’s look at the reading passage.Before you read it,write down eight key words that you expect to find in the reading passage.Is that clear? Ss:Yes. (Students begin to write eight key words.After they finish,teacher says the following.) T:Now,read the passage quickly to check whether the words you’ve written are all in the passage. (Students begin to read the passage and then check their words.As answers are various,teacher may just check two or three students individually.) T:Well,re-read the passage carefully to further understand it.Then answer the questions on the screen. (Show the following on the multimedia.) (责任编辑：admin) |